package date.calendar;

import java.util.Calendar;
import java.util.Date;

public class CTest {
    public static void main(String[] args) {
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        c.add(Calendar.DAY_OF_MONTH, -1);
        System.out.println(c.getTime());

        System.out.println((2021 + 99) / 100);

    }
}
